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Finding the Fourth Proportional to 1,238.79, 1,858.51 and 545.60

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Solution

The fourth proportional to 1,238.79, 1,858.51 and 545.60 is: 818.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.79 : 1,858.51 = 545.60 : x
  2. Step 2: Convert to fraction form
    1,238.79/1,858.51 = 545.60/x
  3. Step 3: Cross multiply
    1,238.79x = 1,858.51 × 545.60
  4. Step 4: Simplify right side
    1,238.79x = 1,013,992.40
  5. Step 5: Solve for x
    x = 1,013,992.40/1,238.79
  6. Step 6: Final answer
    x = 818.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.